Keyhole-guard



res

v UNITED, STA

, JoHN'roMAszEwsKI, or TAUNTON, MASSACHUSETTS."

To all whom it may concern:

Be it knownthat I,-J0HN TOMASZEWSKI, a citizen of Poland, residing at Taunton, county of Bristol, and State of Massachusetts, have invented certain new and useful Improvements in Keyhole-Guards, of which the following is a specification).

This invention relates to new and useful improvements in looks and more particularly toimprovements in the keyhole guards for door locks. Y 1 a I It is the main object of the invention to provide key-hole Y guards which normally close the key-hole and prevent the insertion of the key by persons not in possession of the secret of removing the guard from the key-hole. g

Another object of the present invention is the provision of a movable key-hole guard for locks which can be conveniently "returned into its normal key-hole closing position after each operation of the lock.

With the above and other objects in view, the present invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter referred to and more particularly pointed out in the specification and appended claims.

In the accompanying drawing forming'a part of this application,

Figure 1 is a side view of a lock protected by key-hole guards constructed according to the present invention.

Fig. 2 is a rear view of a plate provided with a key-hole guard according to the present invention taken along line 2-2 of Fig. 3 is a view similar to the view Fig. 2 of a'modified form of plate, the view beingptaken along line 33 of Fig. '1.

ig. 4 is a sectional view taken on line a 4-4 of Fig. 2, and

Fig. 5 is a detail view of akey with a guard-plate operating point. I

In carryingout my invention, I provide an ordinary door lock 10 provided with the latch 11 operated by knobs 12 and 13 and locking member 14 in the'casing 15 which is set in a door and secured therein by means of screws 16 and 17 passed through the end plate 18 of the casing. All of the parts described so far do not form any part of the present invention.

To both sides of a door two plates 19 and 20 respectively are secured by means of screws passed through holes 21 in said plates.

PATENTOF Specification of Letters Patent;

Applicationifiled June 18,

xE noLE-eUAnn.

Patented May 24, 1921. 1929. Serial No. 389,804.

These plates are each provided with raised and lncllned marginal flanges 22 so that a space s provided between the plates and the doorfaces, andthey have each a hole23 for the passage of the shank 24 to which the door knobs are fastened and a key-hole 25 for the insertion of a ke [As shown in F 1g. 2, the key-hole 25 of the platel t? is normally closed by a plate'26 provided near itsendswith guideslots 27 providing rods 28 and 29 which slide vertically through guide-pieces 30 and 31 secured to the inner wall of the plate 19. Near its lower edge of the plate 26 is provided with a plurality of holes or 'openings 32,

FICVE.

one of whichis engaged by a p1n'33 atthe 3 front face of a leaf spring'34 secured to the inner face of the plate 19 as indicated at 35 so that the plate 26 is normally closing the key-hole 25. If however by a suitable tool as for instance the pin point or projection 36 of the key 37 the engagement between the pin 33 of the spring, 3 1 and the hole 32 in the plate 26 is interrupted by pressing the spring 34 backward, the plate 26 is drawn upward by the spring 38 secured with one end to the inner face of theplate 19 and with its otherend to the inner face of the plate 26, and the key-hole is open for the insertion of the key to operate the look. When it is desired to close the key-hole again, the projection 36 of the key 37 is inserted into hole 39 of the plate 26 which at downwardwith its hole 32 into engagement with the pin 33 of the spring 34.

As shown in Fig. 3, the guard-plate 40 for thekey-hole 25 is provided near its upper and loweredge with guide slots 41. and 42 providing bars 43and 44:, and hooks 4:5

and 46 secured with their-"shanks to the "inner face of the plate 20 and guided in the slots 41 and 42 bent over, the plate 40, allow a displacement of the plate 40lat-erally, within certain limits. to the inner face of the plate 20 and to the plate 40 near its outer edge will draw said A spring 417 secured plate back into its key-hole guarding posi- J tion if the same has been displaced in order to allow the insertion of the keyinto the 1 key-hole; it will be clear that upon the with drawal of the key from'th'e hole the plate 40 will be automatically drawn into closing position by the spring 47.

vious that various changes in the detailsof construction may be resorted to for successfully carrying my invention into practice,

without sacrificing any of the novel features,

or departing from the scope of the invention as defined by the appended claims.

Having thusdescribed my invention, what I claim is t 1. A key-hole guard ofthe character described comprising a plat'e'aidapted to be secured to a door .over a lock in spaced relation to said door and having a key-hole, a sliding lockingplate on the rear faceof said first named plate provided with a plurality of perforations, means for guiding said locking plate during its operation, a leaf spring secured to said plate, a pin on said spring adapted to engage in one of the perforations of said locking plate, means for interrupting the engagement between said pin and said locking plate, and means for returning said locking plate into its locking posialeaf spring secured to said plate, a pin on said spring adapted to normally engage one of the perforations of said locking plate, and adapted to be disengaged from said perforation b a tool inserted through another of the perforations of said locking plate, and means for returning said locking plate into its locking position after each operation of the lock.

, In testimony whereof I have afiixed my signature.

JoHN TOMASZEWSKI.

m arlc fitness:

-CHAnLEs J. Nlorrons. 

